need help
need help Ok heres the deal i have a 2001 camaro z28 auto, bought it 9 months ago used from a dealer (gm certified used vehicle)with46,500 miles on it....now at 51,200. well today after work one of my co workers happened to be around when i got in my car ... so he starts to look at it and tells me that he wants to look at the engine bay so i opened the hood and turn the car on, next thing i know he tells me that he hears a noise (engine knocking???)... i give it some gas and he still hears it , so i go close to the engine bay and heard it my self....so im freaked out now about it ...i came home let the car sit for about 30 min. went back outside to check it out again but i didnt hear it this time.. my engine is still a bit warm...but no knocking i took it out for a cruise windows down so i could listen for the knocking but none..any ideas?? a read some post about piston slap..not quite sure wether its bad or not..some say that it is suppose to it when engine is cold others say its not ...any help will be appreciated...
i just went outside to check it out again and sure enough just for a minute or less but then went away the engine was a bit warm though so i believ it only does it when the engine is cold and once it warms up it goes away.. these posts confused me a bit ..https://ls1tech.com/forums/generation-iii-internal-engine/381954-what-piston-slap.html
so is the engine knocking the same as piston slap???
so is the engine knocking the same as piston slap???
TECH Addict
Joined: Feb 2002
Posts: 2,319
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From: Lewisville, Texas
I read that post also and Orangepeel doesn't know what he's talking about. Yes the knocking you hear is piston slap, it's not a big deal. They say it's caused by the short length of the piston skirts on an LS1 piston. Both of my LS1's did it.
Originally Posted by z28_n_tx
i just went outside to check it out again and sure enough just for a minute or less but then went away the engine was a bit warm though so i believ it only does it when the engine is cold and once it warms up it goes away.. these posts confused me a bit ..https://ls1tech.com/forums/showthread.php?t=381954
so is the engine knocking the same as piston slap???
so is the engine knocking the same as piston slap???
Last edited by Elite_Hot_Rod; Sep 18, 2005 at 10:54 PM.
feel a bit better now thanks...(elite_hot_rod how did you make it go away??) oh and how is the engine knocking diff from piston slap?? does it sound the same??? my co worker said it was engine knocking....sorry for all the questions.. thanks again guys
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Verdad Gallardo TECH Addict
Joined: Feb 2002
Posts: 2,319
Likes: 0
From: Lewisville, Texas
You don't make it go away, you live with it, no biggie. There are 2 knock sensors mounted on top of the valley pan which pick up knock, if it's bad enough the PCM will pull timing and you should get an SES light if I remember correctly. This type of knock is fairly serious but I don't think that's what you are experiencing.
Originally Posted by z28_n_tx
feel a bit better now thanks...(elite_hot_rod how did you make it go away??) oh and how is the engine knocking diff from piston slap?? does it sound the same??? my co worker said it was engine knocking....sorry for all the questions.. thanks again guys
so le tme get this straight ... piston slap never goes away but its not a prob?? so if i warm up the engine and still hear it but not as loud (to where you have get close to the engine is it the same prob?